package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.dto.PasswordEditDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordEditFailedException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对

        //对前端传来的密码进行MD5加密比对
//        public static String md5DigestAsHex(byte[] bytes) {
//            return digestAsHexString("MD5", bytes);
//        }
        password = DigestUtils.md5DigestAsHex(password.getBytes());


        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /**
     * 保存员工信息 通过DTO
     * @param employeeDTO 员工信息DTO
     */

    @Override
    public void save(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        //拷贝属性
        BeanUtils.copyProperties(employeeDTO, employee);
        //设置employee其他属性
        employee.setStatus(StatusConstant.ENABLE);
        //设置密码
        //优化为 密码常量池 PasswordConstant.DEFAULT_PASSWORD
//        employee.setPassword(DigestUtils.md5DigestAsHex("123456".getBytes()));
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));


        //设置当前创建时间和修改时间
        employee.setCreateTime(LocalDateTime.now());
        employee.setUpdateTime(LocalDateTime.now());

        //设置创建人和修改人的id
//        通过ThreadLocal 继而token令牌的生成来获取id
//        BaseContext.getCurrentId();
//        employee.setCreateUser(BaseContext.getCurrentId());
//        employee.setUpdateUser(BaseContext.getCurrentId());
        //保存到数据库
        employeeMapper.insert(employee);


    }

    /**
     * 分页查询员工信息
     * @param employeePageQueryDTO 分页查询条件
     * @return PageResult 分页查询结果
     */
    @Override
    public PageResult pageQueryEmployeeDTO(EmployeePageQueryDTO employeePageQueryDTO) {
//        String userName = employeePageQueryDTO.getName();
        //分页的Page 和 pageSize的设置 通过PageHelper 实现
        PageHelper.startPage(employeePageQueryDTO.getPage(), employeePageQueryDTO.getPageSize());
//        Employee employee = employeeMapper.getByUsername(userName);
        //返回值是固定的 为 Page
        Page<Employee> page = employeeMapper.pageQueryEmployeeDTO(employeePageQueryDTO);

        //封装PageResult
        long total = page.getTotal();
        List<Employee> result = page.getResult();
        return new PageResult(total, result);
    }

    /**
     * 更新员工状态
     * @param status 状态
     * @param id 员工id
     */
    @Override
    public void updateStatusById(Integer status ,Long id) {
        //根据Builder模式构建对象
        Employee employee = Employee.builder().id(id).status(status).build();

        //更新数据库
        employeeMapper.updateById(employee);
    }

    /**
     * 根据id查询员工信息
     * @param id 员工id
     * @return 员工信息
     */
    @Override
    public EmployeeDTO getById(Long id) {
        Employee employee = employeeMapper.getById(id);
        EmployeeDTO employeeDTO = new EmployeeDTO();
        BeanUtils.copyProperties(employee,employeeDTO);
        return employeeDTO;
    }

    @Override
    public void update(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO, employee);
        //修改时间
//        employee.setId(BaseContext.getCurrentId());
//        employee.setUpdateTime(LocalDateTime.now());

        //复用方法
        employeeMapper.updateById(employee);
    }

    /**
     * 更新密码
     * @param passwordEditDTO 密码修改DTO
     */
    @Override
    public void updatePassword( PasswordEditDTO passwordEditDTO) {
        //TODO 未完成
        Employee employee = employeeMapper.getById(passwordEditDTO.getEmpId());
        if(!employee.getPassword().equals(DigestUtils.md5DigestAsHex(passwordEditDTO.getOldPassword().getBytes()))){
            //自定义 原密码不对的异常
            throw new PasswordEditFailedException(MessageConstant.OLD_PASSWORD_INCORRECT);
        }
        employee.setPassword(DigestUtils.md5DigestAsHex(passwordEditDTO.getNewPassword().getBytes()));
        //更新时间
//        employee.setUpdateTime(LocalDateTime.now());
//        //更新人id
//        employee.setUpdateUser(BaseContext.getCurrentId());
        employeeMapper.updateById(employee);
    }


}
